| 1 |
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| 2 |
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| 3 | /**
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| 4 | * Array lastIndexOf
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| 5 | */
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| 6 | function lastIndexOf(arr, item, fromIndex) {
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| 7 | if (arr == null) {
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| 8 | return -1;
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| 9 | }
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| 10 |
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| 11 | var len = arr.length;
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| 12 | fromIndex = (fromIndex == null || fromIndex >= len)? len - 1 : fromIndex;
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| 13 | fromIndex = (fromIndex < 0)? len + fromIndex : fromIndex;
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| 14 |
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| 15 | while (fromIndex >= 0) {
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| 16 | // we iterate over sparse items since there is no way to make it
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| 17 | // work properly on IE 7-8. see #64
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| 18 | if (arr[fromIndex] === item) {
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| 19 | return fromIndex;
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| 20 | }
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| 21 | fromIndex--;
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| 22 | }
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| 23 |
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| 24 | return -1;
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| 25 | }
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| 26 |
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| 27 | module.exports = lastIndexOf;
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| 28 |
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